kernel.git/arch/powerpc/kernel/signal.c, branch linux-5.10.y

powerpc: add support for TIF_NOTIFY_SIGNAL

2023-01-04T10:39:19Z

[ Upstream commit 900f0713fdd730fab0f0bfa4a8ca4db2a8985bbe ] Wire up TIF_NOTIFY_SIGNAL handling for powerpc. Cc: linuxppc-dev@lists.ozlabs.org Acked-by: Michael Ellerman Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

Merge tag 'arch-cleanup-2020-10-22' of git://git.kernel.dk/linux-block

2020-10-23T17:06:38Z

Pull arch task_work cleanups from Jens Axboe: "Two cleanups that don't fit other categories: - Finally get the task_work_add() cleanup done properly, so we don't have random 0/1/false/true/TWA_SIGNAL confusing use cases. Updates all callers, and also fixes up the documentation for task_work_add(). - While working on some TIF related changes for 5.11, this TIF_NOTIFY_RESUME cleanup fell out of that. Remove some arch duplication for how that is handled" * tag 'arch-cleanup-2020-10-22' of git://git.kernel.dk/linux-block: task_work: cleanup notification modes tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume()

tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume()

2020-10-17T21:04:36Z

All the callers currently do this, clean it up and move the clearing into tracehook_notify_resume() instead. Reviewed-by: Oleg Nesterov Reviewed-by: Thomas Gleixner Signed-off-by: Jens Axboe

powerpc: remove address space overrides using set_fs()

2020-09-09T02:21:37Z

Stop providing the possibility to override the address space using set_fs() now that there is no need for that any more. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro

powerpc/64s: system call support for scv/rfscv instructions

2020-07-22T13:00:27Z

Add support for the scv instruction on POWER9 and later CPUs. For now this implements the zeroth scv vector 'scv 0', as identical to 'sc' system calls, with the exception that LR is not preserved, nor are volatile CR registers, and error is not indicated with CR0[SO], but by returning a negative errno. rfscv is implemented to return from scv type system calls. It can not be used to return from sc system calls because those are defined to preserve LR. getpid syscall throughput on POWER9 is improved by 26% (428 to 318 cycles), largely due to reducing mtmsr and mtspr. Signed-off-by: Nicholas Piggin [mpe: Fix ppc64e build] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200611081203.995112-3-npiggin@gmail.com

powerpc/watchpoint: Convert thread_struct->hw_brk to an array

2020-05-18T14:11:05Z

So far powerpc hw supported only one watchpoint. But Power10 is introducing 2nd DAWR. Convert thread_struct->hw_brk into an array. Signed-off-by: Ravi Bangoria Signed-off-by: Michael Ellerman Reviewed-by: Michael Neuling Link: https://lore.kernel.org/r/20200514111741.97993-10-ravi.bangoria@linux.ibm.com

powerpc/watchpoint: Provide DAWR number to __set_breakpoint

2020-05-18T14:11:04Z

Introduce new parameter 'nr' to __set_breakpoint() which indicates which DAWR should be programed. Also convert current_brk variable to an array. Signed-off-by: Ravi Bangoria Signed-off-by: Michael Ellerman Reviewed-by: Michael Neuling Link: https://lore.kernel.org/r/20200514111741.97993-7-ravi.bangoria@linux.ibm.com

powerpc: Use trap metadata to prevent double restart rather than zeroing trap

2020-05-15T01:58:54Z

It's not very nice to zero trap for this, because then system calls no longer have trap_is_syscall(regs) invariant, and we can't distinguish between sc and scv system calls (in a later patch). Take one last unused bit from the low bits of the pt_regs.trap word for this instead. There is not a really good reason why it should be in trap as opposed to another field, but trap has some concept of flags and it exists. Ideally I think we would move trap to 2-byte field and have 2 more bytes available independently. Add a selftests case for this, which can be seen to fail if trap_norestart() is changed to return false. Signed-off-by: Nicholas Piggin [mpe: Make them static inlines] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200507121332.2233629-4-mpe@ellerman.id.au

powerpc: trap_is_syscall() helper to hide syscall trap number

2020-05-15T01:58:54Z

A new system call interrupt will be added with a new trap number. Hide the explicit 0xc00 test behind an accessor to reduce churn in callers. Signed-off-by: Nicholas Piggin [mpe: Make it a static inline] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200507121332.2233629-3-mpe@ellerman.id.au

powerpc/64: make buildable without CONFIG_COMPAT

2020-04-02T13:10:00Z

There are numerous references to 32bit functions in generic and 64bit code so ifdef them out. Signed-off-by: Michal Suchanek Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/e5619617020ef3a1f54f0c076e7d74cb9ec9f3bf.1584699455.git.msuchanek@suse.de