kernel.git/include/linux/kernel.h, branch linux-5.1.y

linux/kernel.h: fix overflow for DIV_ROUND_UP_ULL

2019-07-21T07:02:01Z

[ Upstream commit 8f9fab480c7a87b10bb5440b5555f370272a5d59 ] DIV_ROUND_UP_ULL adds the two arguments and then invokes DIV_ROUND_DOWN_ULL. But on a 32bit system the addition of two 32 bit values can overflow. DIV_ROUND_DOWN_ULL does it correctly and stashes the addition into a unsigned long long so cast the result to unsigned long long here to avoid the overflow condition. [akpm@linux-foundation.org: DIV_ROUND_UP_ULL must be an rval] Link: http://lkml.kernel.org/r/20190625100518.30753-1-vkoul@kernel.org Signed-off-by: Vinod Koul Reviewed-by: Andrew Morton Cc: Bjorn Andersson Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin

linux/kernel.h: Use parentheses around argument in u64_to_user_ptr()

2019-04-03T09:43:49Z

Use parentheses around uses of the argument in u64_to_user_ptr() to ensure that the cast doesn't apply to part of the argument. There are existing uses of the macro of the form u64_to_user_ptr(A + B) which expands to (void __user *)(uintptr_t)A + B (the cast applies to the first operand of the addition, the addition is a pointer addition). This happens to still work as intended, the semantic difference doesn't cause a difference in behavior. But I want to use u64_to_user_ptr() with a ternary operator in the argument, like so: u64_to_user_ptr(A ? B : C) This currently doesn't work as intended. Signed-off-by: Jann Horn Signed-off-by: Borislav Petkov Reviewed-by: Mukesh Ojha Cc: Andrei Vagin Cc: Andrew Morton Cc: Dan Carpenter Cc: Greg Kroah-Hartman Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Jani Nikula Cc: Kees Cook Cc: Masahiro Yamada Cc: NeilBrown Cc: Peter Zijlstra Cc: Qiaowei Ren Cc: Thomas Gleixner Cc: x86-ml Link: https://lkml.kernel.org/r/20190329214652.258477-1-jannh@google.com

linux/kernel.h: split _MAX and _MIN macros into

2019-03-08T02:31:59Z

tends to be cluttered because we often put various sort of unrelated stuff in it. So, we have split out a sensible chunk of code into a separate header from time to time. This commit splits out the *_MAX and *_MIN defines. The standard header contains various MAX, MIN constants including numerial limits. [1] I think it makes sense to move in-kernel MAX, MIN constants into include/linux/limits.h. We already have include/uapi/linux/limits.h to contain some user-space constants. I changed its include guard to _UAPI_LINUX_LIMITS_H. This change has no impact to the user-space because scripts/headers_install.sh rips off the '_UAPI' prefix from the include guards of exported headers. [1] http://pubs.opengroup.org/onlinepubs/009604499/basedefs/limits.h.html Link: http://lkml.kernel.org/r/1549156242-20806-2-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada Cc: Alex Elder Cc: Alexey Dobriyan Cc: Zhang Yanmin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

linux/kernel.h: use 'short' to define USHRT_MAX, SHRT_MAX, SHRT_MIN

2019-03-08T02:31:59Z

The commit log of 44f564a4bf6a ("ipc: add definitions of USHORT_MAX and others") did not explain why it used (s16) and (u16) instead of (short) and (unsigned short). Let's use (short) and (unsigned short), which is more sensible, and more consistent with the other MAX/MIN defines. As you see in include/uapi/asm-generic/int-ll64.h, s16/u16 are typedef'ed as signed/unsigned short. So, this commit does not have a functional change. Remove the unneeded parentheses around ~0U while we are here. Link: http://lkml.kernel.org/r/1549156242-20806-1-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada Cc: Alexey Dobriyan Cc: Zhang Yanmin Cc: Alex Elder Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

: drop the gcc-3.3 'const' hack in roundup()

2019-03-08T02:31:59Z

The single quotation marks around "const" were causing a documentation markup warning with reST. Instead of fixing that warning, just delete that comment line and the gcc-3.3 hack of using "const" in the roundup() macro since gcc-3.3 is no longer supported for kernel builds. I did around 20 different $arch builds with no problems, but we'll just have to see if this causes problems for anyone else out there. Link: http://lkml.kernel.org/r/ec5dcf72-7c3e-3513-af0c-4003ed598854@infradead.org Signed-off-by: Randy Dunlap Suggested-by: Matthew Wilcox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kernel.h: unconditionally include asm/div64.h for do_div()

2019-03-08T02:31:59Z

Include asm/div64.h for do_div() usage in DIV_ROUND_DOWN_ULL() and DIV_ROUND_CLOSEST_ULL(). Remove the old CONFIG_LBDAF=y conditional include. Link: http://lkml.kernel.org/r/20181228153430.23763-1-jani.nikula@intel.com Signed-off-by: Jani Nikula Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

bpf: check that BPF programs run with preemption disabled

2019-02-19T20:53:07Z

Introduce cant_sleep() macro for annotation of functions that cannot sleep. Use it in BPF_PROG_RUN to catch execution of BPF programs in preemptable context. Suggested-by: Jann Horn Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Signed-off-by: Daniel Borkmann

kernel/sysctl: add panic_print into sysctl

2019-01-04T21:13:47Z

So that we can also runtime chose to print out the needed system info for panic, other than setting the kernel cmdline. Link: http://lkml.kernel.org/r/1543398842-19295-3-git-send-email-feng.tang@intel.com Signed-off-by: Feng Tang Suggested-by: Steven Rostedt Acked-by: Steven Rostedt (VMware) Cc: Thomas Gleixner Cc: John Stultz Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Kees Cook Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kernel.h: documentation for roundup() vs round_up()

2018-08-22T17:52:46Z

Things like 3619dec5103d ("dh key: fix rounding up KDF output length") expose the lack of explicit documentation for roundup() vs round_up(). At least we can try to document it better if anyone goes looking. Link: http://lkml.kernel.org/r/20180703041950.GA43464@beast Signed-off-by: Kees Cook Cc: Ingo Molnar Cc: Greg Kroah-Hartman Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kernel.h: Fix a typo in comment

2018-06-21T15:39:18Z

Signed-off-by: Wei Wang Cc: Andrew Morton Cc: Borislav Petkov Cc: Crt Mori Cc: Josh Poimboeuf Cc: Kees Cook Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Randy Dunlap Cc: Steven Rostedt Cc: Thomas Gleixner Cc: gregkh@linuxfoundation.org Cc: wei.vince.wang@gmail.com Link: https://lkml.kernel.org/lkml/20180424212241.16013-1-wvw@google.com Signed-off-by: Ingo Molnar

kernel.git/include/linux/kernel.h, branch linux-5.1.y

linux/kernel.h: fix overflow for DIV_ROUND_UP_ULL

linux/kernel.h: Use parentheses around argument in u64_to_user_ptr()

linux/kernel.h: split *_MAX and *_MIN macros into

linux/kernel.h: use 'short' to define USHRT_MAX, SHRT_MAX, SHRT_MIN

: drop the gcc-3.3 'const' hack in roundup()

kernel.h: unconditionally include asm/div64.h for do_div()

bpf: check that BPF programs run with preemption disabled

kernel/sysctl: add panic_print into sysctl

kernel.h: documentation for roundup() vs round_up()

kernel.h: Fix a typo in comment

linux/kernel.h: split _MAX and _MIN macros into