kernel.git/arch/x86/kernel/e820.c, branch linux-4.12.y

x86/boot/e820: Remove a redundant self assignment

2017-04-14T09:43:21Z

Remove a redundant self assignment of table->nr_entries, it does nothing and is an artifact of code simplification re-work. Detected by CoverityScan, CID#1428450 ("Self assignment") Fixes: 441ac2f33dd7 ("x86/boot/e820: Simplify e820__update_table()") Signed-off-by: Colin Ian King Cc: kernel-janitors@vger.kernel.org Cc: Denys Vlasenko Link: http://lkml.kernel.org/r/20170413155912.12078-1-colin.king@canonical.com Signed-off-by: Thomas Gleixner

x86/boot: Fix pr_debug() API braindamage

2017-02-01T10:07:23Z

What looked like a straightforward conversion from printk(KERN_DEBUG, ...) to pr_debug() broke the boot log output: DMI: /M57SLI-S4, BIOS FF 01/24/2008 -e820: update [mem 0x00000000-0x00000fff] usable ==> reserved -e820: remove [mem 0x000a0000-0x000fffff] usable +usable ==> reserved +usable e820: last_pfn = 0x230000 max_arch_pfn = 0x400000000 ... x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT -e820: update [mem 0xd0000000-0xffffffff] usable ==> reserved +usable ==> reserved i.e. spurious (and nonsensical) kernel log entries were created... We need a pr_debug_and_I_mean_it() function which does nothing but printk(KERN_DEBUG... Signed-off-by: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org [ Wrote changelog. ] Signed-off-by: Ingo Molnar

x86/boot/e820: Simplify e820__update_table()

2017-01-30T08:49:28Z

- Remove the now unnecessary __e820__update_table() wrappery - Move statics out from function scope, to make the logic clearer - Rename local variables to be more in line with the rest of 820.c - Remove unnecessary local variables: old_nr, *nr_entries No change in functionality. Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

x86/boot/e820: Separate the E820 ABI structures from the in-kernel structures

2017-01-29T12:39:32Z

Linus pointed out that relying on the compiler to pack structures with enums is fragile not just for the kernel, but for external tooling as well which might rely on our UAPI headers. So separate the two from each other: introduce 'struct boot_e820_entry', which is the boot protocol entry format. This actually simplifies the code, as e820__update_table() is now never called directly with boot protocol table entries - we can rely on append_e820_table() and do a e820__update_table() call afterwards. ( This will allow further simplifications of __e820__update_table(), but that will be done in a separate patch. ) This change also has the side effect of not modifying the bootparams structure anymore - which might be useful for debugging. In theory we could even constify the boot_params structure - at least from the E820 code's point of view. Remove the uapi/asm/e820/types.h file, as it's not used anymore - all kernel side E820 types are defined in asm/e820/types.h. Reported-by: Linus Torvalds Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

x86/boot/e820: Fix and clean up e820_type switch() statements

2017-01-29T12:39:31Z

A test-build of e820.o with -Wswitch-enum shows the following warnings: arch/x86/kernel/e820.c: In function ‘e820_type_to_string’: arch/x86/kernel/e820.c:965:2: warning: enumeration value ‘E820_TYPE_RESERVED’ not handled in switch [-Wswitch-enum] switch (entry->type) { ^ arch/x86/kernel/e820.c: In function ‘e820_type_to_iomem_type’: arch/x86/kernel/e820.c:979:2: warning: enumeration value ‘E820_TYPE_RESERVED’ not handled in switch [-Wswitch-enum] switch (entry->type) { ^ arch/x86/kernel/e820.c: In function ‘e820_type_to_iores_desc’: arch/x86/kernel/e820.c:993:2: warning: enumeration value ‘E820_TYPE_RESERVED’ not handled in switch [-Wswitch-enum] switch (entry->type) { ^ arch/x86/kernel/e820.c: In function ‘do_mark_busy’: arch/x86/kernel/e820.c:1015:2: warning: enumeration value ‘E820_TYPE_RAM’ not handled in switch [-Wswitch-enum] switch (type) { ^ Here's the four warnings: - The one in e820_type_to_string() is a borderline bug, we should differentiate known-reserved E820 types from unknown types. Fix it by printing a separate message for unknown E820 types. - The ones in e820_type_to_iomem_type(), e820_type_to_iores_desc() and do_mark_busy() are worth documenting, at least to the extent of enumerating them explicitly. Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

x86/boot/e820: Rename the remaining E820 APIs to the e820__*() prefix

2017-01-28T21:55:26Z

Three more renames left: e820_end_of_ram_pfn() => e820__end_of_ram_pfn() e820_end_of_low_ram_pfn() => e820__end_of_low_ram_pfn() e820_reallocate_tables() => e820__reallocate_tables() After this all E820 API calls are prefixed with "e820__", making it much easier to grep for E820 functionality in the kernel. No change in functionality. Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

x86/boot/e820: Remove unnecessary #include's

2017-01-28T21:55:26Z

A number of headers were included into e820.c unnecessarily - remove them. No change in functionality. Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

x86/boot/e820: Rename e820_mark_nosave_regions() to e820__register_nosave_regions()

2017-01-28T21:55:26Z

This function is a minor misnomer: it is talking about 'marking' regions as nosave - while the hibernation API is called register_nosave_region() and the e820_mark_nosave_regions() is a wrapper around that functionality. So name it to be in line with the API it is derived from. ( Rename e820_mark_nvs_memory() to e820__register_nvs_regions(), for similar reasons. ) No change in functionality. Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

x86/boot/e820: Rename e820_reserve_resources() to e820__reserve_resources()

2017-01-28T21:55:25Z

Also do some minor cleanups. No change in functionality. Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

x86/boot/e820: Use bool in query APIs

2017-01-28T21:55:25Z

Change e820__mapped_any() and e820__mapped_all()'s return type and e820__range_remove()'s check_type parameter to bool. Propagate it into arch/x86/pci/mmconfig-shared.c as this change affects a function signature there too. No change in functionality. Cc: Alex Thorlton Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dan Williams Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Huang, Ying Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Paul Jackson Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wei Yang Cc: Yinghai Lu Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

kernel.git/arch/x86/kernel/e820.c, branch linux-4.12.y

x86/boot/e820: Remove a redundant self assignment

x86/boot: Fix pr_debug() API braindamage

x86/boot/e820: Simplify e820__update_table()

x86/boot/e820: Separate the E820 ABI structures from the in-kernel structures

x86/boot/e820: Fix and clean up e820_type switch() statements

x86/boot/e820: Rename the remaining E820 APIs to the e820__*() prefix

x86/boot/e820: Remove unnecessary #include's

x86/boot/e820: Rename e820_mark_nosave_regions() to e820__register_nosave_regions()

x86/boot/e820: Rename e820_reserve_resources*() to e820__reserve_resources*()

x86/boot/e820: Use bool in query APIs

x86/boot/e820: Rename e820_reserve_resources() to e820__reserve_resources()