[PATCH] ARM: disable vmap'ed stacks on suspend-capable SMP configs

* [PATCH] ARM: disable vmap'ed stacks on suspend-capable SMP configs
@ 2022-01-05 14:34 Ard Biesheuvel
  0 siblings, 0 replies; only message in thread
From: Ard Biesheuvel @ 2022-01-05 14:34 UTC (permalink / raw)
  To: linux
  Cc: linux-arm-kernel, arnd, linus.walleij, keescook, Ard Biesheuvel,
	Marek Szyprowski, Geert Uytterhoeven, Jon Hunter

There are several reports about the new vmap'ed stacks code breaking
suspend/resume on Exynos, Renesas and Tegra SMP platforms. While this is
under investigation, let's disable the vmap'ed stacks feature for the
time being for SMP configurations that have suspend/resume enabled.

[0] https://lore.kernel.org/linux-arm-kernel/20211122092816.2865873-8-ardb@kernel.org/

Cc: Marek Szyprowski <m.szyprowski@samsung•com>
Cc: Geert Uytterhoeven <geert@linux-m68k•org>
Cc: Jon Hunter <jonathanh@nvidia•com>
Signed-off-by: Ard Biesheuvel <ardb@kernel•org>
---
 arch/arm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4817343b1d97..938f7c392cc7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -129,7 +129,7 @@ config ARM
 	select RTC_LIB
 	select SYS_SUPPORTS_APM_EMULATION
 	select THREAD_INFO_IN_TASK
-	select HAVE_ARCH_VMAP_STACK if MMU && (!LD_IS_LLD || LLD_VERSION >= 140000)
+	select HAVE_ARCH_VMAP_STACK if MMU && (!LD_IS_LLD || LLD_VERSION >= 140000) && !PM_SLEEP_SMP
 	select TRACE_IRQFLAGS_SUPPORT if !CPU_V7M
 	# Above selects are sorted alphabetically; please add new ones
 	# according to that.  Thanks.
-- 
2.30.2


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