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Date: Wed, 10 Nov 2021 10:46:42 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Peter Zijlstra' <peterz@...radead.org>, Nick Desaulniers <ndesaulniers@...gle.com> CC: Bill Wendling <morbo@...gle.com>, Josh Poimboeuf <jpoimboe@...hat.com>, "x86@...nel.org" <x86@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "mark.rutland@....com" <mark.rutland@....com>, "dvyukov@...gle.com" <dvyukov@...gle.com>, "seanjc@...gle.com" <seanjc@...gle.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>, "mbenes@...e.cz" <mbenes@...e.cz>, "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>, "linux-toolchains@...r.kernel.org" <linux-toolchains@...r.kernel.org> Subject: RE: [PATCH 20/22] x86,word-at-a-time: Remove .fixup usage From: Peter Zijlstra > Sent: 09 November 2021 21:08 ... > > GCC does the same, but I wanted to have the exception stuff be in > .text.cold, but alas it doesn't do that. I left the attribute because of > it's descriptive value. > > > Unless the cold attribute is helping move > > ("shrink-wrap"?) the basic block to a whole other section > > (.text.cold.)? > > I was hoping it would do that, but it doesn't on gcc-11. Wouldn't moving part of a function to .text.cold (or .text.unlikely) generate the same problems with the stack backtrace code as the .text.fixup section you are removing had?? David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
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