From: David Laight <David.Laight@ACULAB.COM> To: 'Borislav Petkov' <bp@alien8.de>, Arvind Sankar <nivedita@alum.mit.edu> Cc: "Nick Desaulniers" <ndesaulniers@google.com>, "Michael Matz" <matz@suse.de>, "Jakub Jelinek" <jakub@redhat.com>, "Sergei Trofimovich" <slyfox@gentoo.org>, LKML <linux-kernel@vger.kernel.org>, "Thomas Gleixner" <tglx@linutronix.de>, "Ingo Molnar" <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, "Andy Lutomirski" <luto@kernel.org>, "Peter Zijlstra" <peterz@infradead.org>, "x86@kernel.org" <x86@kernel.org>, clang-built-linux <clang-built-linux@googlegroups.com>, "Kees Cook" <keescook@chromium.org>, "Martin Liška" <mliska@suse.cz>, "Frédéric Pierret (fepitre)" <frederic.pierret@qubes-os.org>, "boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>, "jgross@suse.com" <jgross@suse.com>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "Michael Ellerman" <mpe@ellerman.id.au>, "Benjamin Herrenschmidt" <benh@kernel.crashing.org>, "Paul Mackerras" <paulus@samba.org> Subject: RE: [PATCH] x86: Fix early boot crash on gcc-10, next try Date: Mon, 27 Apr 2020 17:07:53 +0000 [thread overview] Message-ID: <0ce42f2537124ee3829a307eefd12db4@AcuMS.aculab.com> (raw) In-Reply-To: <20200425175249.GC24294@zn.tnic> From: Borislav Petkov > Sent: 25 April 2020 18:53 ... > IOW, something like this (ontop) which takes care of the xen case too. > If it needs to be used by all arches, then I'll split the patch: . > - asm (""); > + prevent_tail_call_optimization(); > } One obvious implementation would be a real function call. Which the compiler would convert into a tail call. Just to confuse matters :-) David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
WARNING: multiple messages have this Message-ID (diff)
From: David Laight <David.Laight@ACULAB.COM> To: 'Borislav Petkov' <bp@alien8.de>, Arvind Sankar <nivedita@alum.mit.edu> Cc: "Jakub Jelinek" <jakub@redhat.com>, "jgross@suse.com" <jgross@suse.com>, "x86@kernel.org" <x86@kernel.org>, "Kees Cook" <keescook@chromium.org>, "Peter Zijlstra" <peterz@infradead.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "Michael Matz" <matz@suse.de>, "Nick Desaulniers" <ndesaulniers@google.com>, LKML <linux-kernel@vger.kernel.org>, "Sergei Trofimovich" <slyfox@gentoo.org>, clang-built-linux <clang-built-linux@googlegroups.com>, "Ingo Molnar" <mingo@redhat.com>, "Paul Mackerras" <paulus@samba.org>, "Andy Lutomirski" <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, "Frédéric Pierret (fepitre)" <frederic.pierret@qubes-os.org>, "Thomas Gleixner" <tglx@linutronix.de>, "Martin Liška" <mliska@suse.cz>, "boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com> Subject: RE: [PATCH] x86: Fix early boot crash on gcc-10, next try Date: Mon, 27 Apr 2020 17:07:53 +0000 [thread overview] Message-ID: <0ce42f2537124ee3829a307eefd12db4@AcuMS.aculab.com> (raw) In-Reply-To: <20200425175249.GC24294@zn.tnic> From: Borislav Petkov > Sent: 25 April 2020 18:53 ... > IOW, something like this (ontop) which takes care of the xen case too. > If it needs to be used by all arches, then I'll split the patch: . > - asm (""); > + prevent_tail_call_optimization(); > } One obvious implementation would be a real function call. Which the compiler would convert into a tail call. Just to confuse matters :-) David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2020-04-27 17:07 UTC|newest] Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-14 16:44 [PATCH] x86: fix early boot crash on gcc-10 Sergei Trofimovich 2020-03-16 13:04 ` Peter Zijlstra 2020-03-16 13:26 ` Jakub Jelinek 2020-03-16 13:42 ` Peter Zijlstra 2020-03-16 17:54 ` Borislav Petkov 2020-03-16 18:03 ` Jakub Jelinek 2020-03-17 14:36 ` Borislav Petkov 2020-03-17 14:39 ` Jakub Jelinek 2020-03-17 14:49 ` Borislav Petkov 2020-03-17 16:35 ` David Laight 2020-03-25 13:31 ` Borislav Petkov 2020-03-26 21:54 ` Sergei Trofimovich 2020-03-26 22:35 ` Borislav Petkov 2020-03-28 8:48 ` [PATCH v2] " Sergei Trofimovich 2020-04-13 14:15 ` [tip: x86/urgent] x86: Fix " tip-bot2 for Sergei Trofimovich 2020-04-13 16:35 ` [PATCH v2] x86: fix " Borislav Petkov 2020-04-14 13:50 ` Michael Matz 2020-04-15 7:48 ` Borislav Petkov 2020-04-15 14:53 ` Michael Matz 2020-04-15 22:19 ` Sergei Trofimovich 2020-04-17 7:57 ` Borislav Petkov 2020-04-17 8:07 ` Jakub Jelinek 2020-04-17 8:42 ` Borislav Petkov 2020-04-17 8:58 ` Jakub Jelinek 2020-04-17 9:09 ` Borislav Petkov 2020-04-17 18:15 ` Nick Desaulniers 2020-04-17 18:22 ` Nick Desaulniers 2020-04-17 19:06 ` Jakub Jelinek 2020-04-17 19:49 ` Nick Desaulniers 2020-04-17 19:53 ` Nick Desaulniers 2020-04-20 14:04 ` Michael Matz 2020-04-22 10:23 ` Borislav Petkov 2020-04-22 11:40 ` Peter Zijlstra 2020-04-22 13:49 ` Borislav Petkov 2020-04-22 13:55 ` Jakub Jelinek 2020-04-22 14:16 ` Martin Liška 2020-04-22 15:06 ` Michael Matz 2020-04-22 16:53 ` Borislav Petkov 2020-04-22 17:02 ` Jakub Jelinek 2020-04-22 18:47 ` Nick Desaulniers 2020-04-22 18:55 ` Nick Desaulniers 2020-04-22 19:21 ` Borislav Petkov 2020-04-22 21:05 ` Nick Desaulniers 2020-04-22 21:26 ` Borislav Petkov 2020-04-22 22:57 ` Nick Desaulniers 2020-04-23 12:53 ` Borislav Petkov 2020-04-23 16:12 ` [PATCH] x86: Fix early boot crash on gcc-10, next try Borislav Petkov 2020-04-23 17:30 ` Borislav Petkov 2020-04-23 18:02 ` Nick Desaulniers 2020-04-23 18:27 ` Borislav Petkov 2020-04-27 11:37 ` [tip: x86/build] x86/build: Check whether the compiler is sane tip-bot2 for Borislav Petkov 2020-04-23 19:40 ` [PATCH] x86: Fix early boot crash on gcc-10, next try Kees Cook 2020-04-25 1:46 ` Arvind Sankar 2020-04-25 8:57 ` Borislav Petkov 2020-04-25 11:09 ` Jürgen Groß 2020-04-25 15:04 ` Arvind Sankar 2020-04-25 15:04 ` Arvind Sankar 2020-04-25 17:31 ` Borislav Petkov 2020-04-25 17:31 ` Borislav Petkov 2020-04-25 17:52 ` Borislav Petkov 2020-04-25 17:52 ` Borislav Petkov 2020-04-27 17:07 ` David Laight [this message] 2020-04-27 17:07 ` David Laight 2020-04-25 18:37 ` Segher Boessenkool 2020-04-25 18:37 ` Segher Boessenkool 2020-04-25 18:53 ` Borislav Petkov 2020-04-25 18:53 ` Borislav Petkov 2020-04-25 19:15 ` Segher Boessenkool 2020-04-25 19:15 ` Segher Boessenkool 2020-04-25 22:17 ` Borislav Petkov 2020-04-25 22:17 ` Borislav Petkov 2020-04-25 22:25 ` Arvind Sankar 2020-04-25 22:25 ` Arvind Sankar 2020-04-17 10:38 ` [PATCH v2] x86: fix early boot crash on gcc-10 Peter Zijlstra 2020-04-18 13:12 ` David Laight 2020-04-17 10:41 ` Peter Zijlstra 2020-03-16 18:20 ` [PATCH] " Arvind Sankar 2020-03-16 18:54 ` Arvind Sankar 2020-03-16 19:53 ` Arvind Sankar 2020-03-16 20:08 ` Jakub Jelinek 2020-03-16 20:40 ` Arvind Sankar 2020-03-16 22:12 ` Sergei Trofimovich 2020-03-17 11:46 ` Jakub Jelinek 2020-03-17 18:10 ` Sergei Trofimovich 2020-03-16 18:22 ` Arvind Sankar 2020-03-26 23:16 ` [PATCH v2] " Sergei Trofimovich 2020-04-27 11:37 ` [tip: x86/build] x86: Fix early boot crash on gcc-10, next try tip-bot2 for Borislav Petkov 2020-05-15 11:20 ` [tip: x86/urgent] x86: Fix early boot crash on gcc-10, third try tip-bot2 for Borislav Petkov 2020-05-19 11:49 ` Sasha Levin
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