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| author | Rabin Vincent <rabin@rab.in> | 2012-02-15 16:01:42 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-02-15 21:09:52 +0000 |
| commit | 8e43a905dd574f54c5715d978318290ceafbe275 (patch) | |
| tree | 4d2bc5178293689353675105ee37e1c287848f39 /arch/arm | |
| parent | 6e2e340b59d2d4e7b6b7f2c2d02b0d5ca4df6458 (diff) | |
| download | linux-8e43a905dd574f54c5715d978318290ceafbe275.tar.gz linux-8e43a905dd574f54c5715d978318290ceafbe275.tar.bz2 linux-8e43a905dd574f54c5715d978318290ceafbe275.zip | |
ARM: 7325/1: fix v7 boot with lockdep enabled
Bootup with lockdep enabled has been broken on v7 since b46c0f74657d
("ARM: 7321/1: cache-v7: Disable preemption when reading CCSIDR").
This is because v7_setup (which is called very early during boot) calls
v7_flush_dcache_all, and the save_and_disable_irqs added by that patch
ends up attempting to call into lockdep C code (trace_hardirqs_off())
when we are in no position to execute it (no stack, MMU off).
Fix this by using a notrace variant of save_and_disable_irqs. The code
already uses the notrace variant of restore_irqs.
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 5 | ||||
| -rw-r--r-- | arch/arm/mm/cache-v7.S | 2 |
2 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index 62f8095d46de..23371b17b23e 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -137,6 +137,11 @@ disable_irq .endm + .macro save_and_disable_irqs_notrace, oldcpsr + mrs \oldcpsr, cpsr + disable_irq_notrace + .endm + /* * Restore interrupt state previously stored in a register. We don't * guarantee that this will preserve the flags. diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S index 7a24d39661f0..a655d3da386d 100644 --- a/arch/arm/mm/cache-v7.S +++ b/arch/arm/mm/cache-v7.S @@ -55,7 +55,7 @@ loop1: cmp r1, #2 @ see what cache we have at this level blt skip @ skip if no cache, or just i-cache #ifdef CONFIG_PREEMPT - save_and_disable_irqs r9 @ make cssr&csidr read atomic + save_and_disable_irqs_notrace r9 @ make cssr&csidr read atomic #endif mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr isb @ isb to sych the new cssr&csidr |