[PATCH] compiler.h: Raise minimum version of GCC to 5.1 for arm64

[Nathan Chancellor]

On Tue, Jan 12, 2021 at 10:48:32PM +0000, Will Deacon wrote:
> GCC versions >= 4.9 and < 5.1 have been shown to emit memory references
> beyond the stack pointer, resulting in memory corruption if an interrupt
> is taken after the stack pointer has been adjusted but before the
> reference has been executed. This leads to subtle, infrequent data
> corruption such as the EXT4 problems reported by Russell King at the
> link below.
> 
> Life is too short for buggy compilers, so raise the minimum GCC version
> required by arm64 to 5.1.
> 
> Cc: Theodore Ts'o <tytso at mit.edu>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Florian Weimer <fweimer at redhat.com>
> Cc: Peter Zijlstra <peterz at infradead.org>
> Cc: Linus Torvalds <torvalds at linux-foundation.org>
> Cc: Nick Desaulniers <ndesaulniers at google.com>
> Reported-by: Russell King <linux at armlinux.org.uk>
> Suggested-by: Arnd Bergmann <arnd at kernel.org>
> Link: https://lore.kernel.org/r/20210105154726.GD1551@shell.armlinux.org.uk
> Signed-off-by: Will Deacon <will at kernel.org>

Reviewed-by: Nathan Chancellor <natechancellor at gmail.com>
Tested-by: Nathan Chancellor <natechancellor at gmail.com>

> ---
>  include/linux/compiler-gcc.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
> index 74c6c0486eed..555ab0fddbef 100644
> --- a/include/linux/compiler-gcc.h
> +++ b/include/linux/compiler-gcc.h
> @@ -13,6 +13,12 @@
>  /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 */
>  #if GCC_VERSION < 40900
>  # error Sorry, your version of GCC is too old - please use 4.9 or newer.
> +#elif defined(CONFIG_ARM64) && GCC_VERSION < 50100
> +/*
> + * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
> + * https://lore.kernel.org/r/20210107111841.GN1551@shell.armlinux.org.uk
> + */
> +# error Sorry, your version of GCC is too old - please use 5.1 or newer.
>  #endif
>  
>  /*
> -- 
> 2.30.0.284.gd98b1dd5eaa7-goog
>