Messages in this thread | | | Date | Mon, 25 Jul 2022 00:39:53 +0200 | From | "Jason A. Donenfeld" <> | Subject | Re: [linux-stable-rc:linux-5.15.y 6874/8723] arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC |
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Hi Ard,
On Mon, Jul 25, 2022 at 04:14:48AM +0800, kernel test robot wrote: > All warnings (new ones prefixed by >>): > > >> arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC [-W#warnings] > #warning This code requires at least version 4.6 of GCC > ^ > 1 warning generated. > > > vim +30 arch/arm/lib/xor-neon.c > > 01956597cbc46d Ard Biesheuvel 2013-05-17 16 > 01956597cbc46d Ard Biesheuvel 2013-05-17 17 /* > 01956597cbc46d Ard Biesheuvel 2013-05-17 18 * Pull in the reference implementations while instructing GCC (through > 01956597cbc46d Ard Biesheuvel 2013-05-17 19 * -ftree-vectorize) to attempt to exploit implicit parallelism and emit > 01956597cbc46d Ard Biesheuvel 2013-05-17 20 * NEON instructions. > 01956597cbc46d Ard Biesheuvel 2013-05-17 21 */ > 01956597cbc46d Ard Biesheuvel 2013-05-17 22 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) > 01956597cbc46d Ard Biesheuvel 2013-05-17 23 #pragma GCC optimize "tree-vectorize" > 01956597cbc46d Ard Biesheuvel 2013-05-17 24 #else > 01956597cbc46d Ard Biesheuvel 2013-05-17 25 /* > 01956597cbc46d Ard Biesheuvel 2013-05-17 26 * While older versions of GCC do not generate incorrect code, they fail to > 01956597cbc46d Ard Biesheuvel 2013-05-17 27 * recognize the parallel nature of these functions, and emit plain ARM code, > 01956597cbc46d Ard Biesheuvel 2013-05-17 28 * which is known to be slower than the optimized ARM code in asm-arm/xor.h. > 01956597cbc46d Ard Biesheuvel 2013-05-17 29 */ > 01956597cbc46d Ard Biesheuvel 2013-05-17 @30 #warning This code requires at least version 4.6 of GCC > 01956597cbc46d Ard Biesheuvel 2013-05-17 31 #endif > 01956597cbc46d Ard Biesheuvel 2013-05-17 32
Does this file need a depends on ≥4.6 thing in Kconfig? Or is something else happening here since 4.6 isn't even supported by the kernel these days?
Jason
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