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commit dca5244d2f5b94f1809f0c02a549edf41ccd5493 upstream. 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. Reported-by: Russell King <linux@armlinux.org.uk> Suggested-by: Arnd Bergmann <arnd@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: <stable@vger.kernel.org> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Florian Weimer <fweimer@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Link: https://lore.kernel.org/r/20210105154726.GD1551@shell.armlinux.org.uk Link: https://lore.kernel.org/r/20210112224832.10980-1-will@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> [will: backport to 4.4.y/4.9.y/4.14.y; add __clang__ check] Link: https://lore.kernel.org/r/CA+G9fYuzE9WMSB7uGjV4gTzK510SHEdJb_UXQCzsQ5MqA=h9SA@mail.gmail.com Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>