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| author |   Catalin Marinas <catalin.marinas@arm.com> | 2013-07-23 16:15:36 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2013-07-26 12:02:09 +0100 |
| commit | bdae73cd374e28db544fdd9b77de689a36e3c129 (patch) | |
| tree | aa22b6e3e1232f27fa50c24a2144daa65d61d7c6 /arch/arm/include/asm/thread_info.h | |
| parent | ARM: 7789/1: Do not run dummy_flush_tlb_a15_erratum() on non-Cortex-A15 (diff) | |
| download | linux-dev-bdae73cd374e28db544fdd9b77de689a36e3c129.tar.xz linux-dev-bdae73cd374e28db544fdd9b77de689a36e3c129.zip | |
ARM: 7790/1: Fix deferred mm switch on VIVT processors
As of commit b9d4d42ad9 (ARM: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW on
pre-ARMv6 CPUs), the mm switching on VIVT processors is done in the
finish_arch_post_lock_switch() function to avoid whole cache flushing
with interrupts disabled. The need for deferred mm switch is stored as a
thread flag (TIF_SWITCH_MM). However, with preemption enabled, we can
have another thread switch before finish_arch_post_lock_switch(). If the
new thread has the same mm as the previous 'next' thread, the scheduler
will not call switch_mm() and the TIF_SWITCH_MM flag won't be set for
the new thread.
This patch moves the switch pending flag to the mm_context_t structure
since this is specific to the mm rather than thread.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Marc Kleine-Budde <mkl@pengutronix.de>
Tested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: <stable@vger.kernel.org> # 3.5+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/thread_info.h')
| -rw-r--r-- | arch/arm/include/asm/thread_info.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index 214d4158089a..2b8114fcba09 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -156,7 +156,6 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *, #define TIF_USING_IWMMXT 17 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define TIF_RESTORE_SIGMASK 20 -#define TIF_SWITCH_MM 22 /* deferred switch_mm */ #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) |