Bug#762390: Patch for hppa arch
could you please temporarily add this hppa-specific patch to the debian kernel sources? ... diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile index 7187664..5db8882 100644 --- a/arch/parisc/Makefile +++ b/arch/parisc/Makefile @@ -48,7 +48,12 @@ cflags-y := -pipe # These flags should be implied by an hppa-linux configuration, but they # are not in gcc 3.2. -cflags-y += -mno-space-regs -mfast-indirect-calls +cflags-y += -mno-space-regs + +# -mfast-indirect-calls is only relevant for 32-bit kernels. FYI, this patch has now been pushed upstream and scheduled for stable kernel series: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26a7730b5874a5fa6779c62f4ad7c5065a94723 Helge -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/54233be2.1020...@gmx.de
Bug#762390: Patch for hppa arch
On Sun, Sep 21, 2014 at 08:53:39PM +0200, Helge Deller wrote: Package: linux Version: 3.16.3-2 Severity: bug Tags: patch Dear Debian Kernel maintainers, could you please temporarily add this hppa-specific patch to the debian kernel sources? Currently the 64bit hppa kernel gets miscompiled by gcc-4.8 and as such it will not boot. The attached patch fixes one of the problems. Latest changes in gcc-4.8 made changes to the -mfast-indirect-calls option which now produces wrong code when compiling for 64bit. The problem is being worked on in upstream gcc-4.8, and we don't know yet if we will implement -mfast-indirect-calls for 64bit (which might introduce side-effects) or not. That's the reason why I don't want to push attached patch upstream yet. The second problem is, that gcc-4.9 (which is used in debian to bootstrap gcc-4.8) miscompiles one specific gcc-4.8 source code path and this bug is reported upstream in GCC PR: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63302 We work on that too. So, if you could apply the attached patch temporarily for now it would help us to get further. I will either send the patch upstream or we will fix the compiler. The decision is still pending, but I will inform you when this patch can be removed from debian kernel sources again (hopefully soon!). BTW: If you apply it, there is no need to trigger a new upload specifically for this bug/hppa... Thanks, Helge diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile index 7187664..5db8882 100644 --- a/arch/parisc/Makefile +++ b/arch/parisc/Makefile @@ -48,7 +48,12 @@ cflags-y := -pipe # These flags should be implied by an hppa-linux configuration, but they # are not in gcc 3.2. -cflags-y += -mno-space-regs -mfast-indirect-calls +cflags-y += -mno-space-regs + +# -mfast-indirect-calls is only relevant for 32-bit kernels. Would it make sense to point out here that -mfast-indirect-calls is not only unneeded but bad until http://link.to/relevant-discussion is resolved? +ifndef CONFIG_64BIT +cflags-y += -mfast-indirect-calls +endif Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König| Industrial Linux Solutions | http://www.pengutronix.de/ | -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140922072436.gs3...@pengutronix.de
Bug#762390: Patch for hppa arch
On 09/22/2014 09:24 AM, Uwe Kleine-König wrote: diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile --- a/arch/parisc/Makefile +++ b/arch/parisc/Makefile # These flags should be implied by an hppa-linux configuration, but they # are not in gcc 3.2. -cflags-y += -mno-space-regs -mfast-indirect-calls +cflags-y += -mno-space-regs + +# -mfast-indirect-calls is only relevant for 32-bit kernels. Would it make sense to point out here that -mfast-indirect-calls is not only unneeded but bad until http://link.to/relevant-discussion is resolved? Yes, this makes sense, but there is no public visible discussion about it yet. It's in private mail between Dave and myself. Anyway, we decided to push this patch upstream, so I'll add some more comments in the (upstream) changelog then. Helge -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/54206b2e.6040...@gmx.de
Bug#762390: Patch for hppa arch
Package: linux Version: 3.16.3-2 Severity: bug Tags: patch Dear Debian Kernel maintainers, could you please temporarily add this hppa-specific patch to the debian kernel sources? Currently the 64bit hppa kernel gets miscompiled by gcc-4.8 and as such it will not boot. The attached patch fixes one of the problems. Latest changes in gcc-4.8 made changes to the -mfast-indirect-calls option which now produces wrong code when compiling for 64bit. The problem is being worked on in upstream gcc-4.8, and we don't know yet if we will implement -mfast-indirect-calls for 64bit (which might introduce side-effects) or not. That's the reason why I don't want to push attached patch upstream yet. The second problem is, that gcc-4.9 (which is used in debian to bootstrap gcc-4.8) miscompiles one specific gcc-4.8 source code path and this bug is reported upstream in GCC PR: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63302 We work on that too. So, if you could apply the attached patch temporarily for now it would help us to get further. I will either send the patch upstream or we will fix the compiler. The decision is still pending, but I will inform you when this patch can be removed from debian kernel sources again (hopefully soon!). BTW: If you apply it, there is no need to trigger a new upload specifically for this bug/hppa... Thanks, Helge diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile index 7187664..5db8882 100644 --- a/arch/parisc/Makefile +++ b/arch/parisc/Makefile @@ -48,7 +48,12 @@ cflags-y := -pipe # These flags should be implied by an hppa-linux configuration, but they # are not in gcc 3.2. -cflags-y += -mno-space-regs -mfast-indirect-calls +cflags-y += -mno-space-regs + +# -mfast-indirect-calls is only relevant for 32-bit kernels. +ifndef CONFIG_64BIT +cflags-y += -mfast-indirect-calls +endif # Currently we save and restore fpregs on all kernel entry/interruption paths. # If that gets optimized, we might need to disable the use of fpregs in the
Bug#762390: Patch for hppa arch
On Sun, 2014-09-21 at 20:53 +0200, Helge Deller wrote: Package: linux Version: 3.16.3-2 Severity: bug Tags: patch Dear Debian Kernel maintainers, could you please temporarily add this hppa-specific patch to the debian kernel sources? [...] Applied, thanks. Ben. -- Ben Hutchings We get into the habit of living before acquiring the habit of thinking. - Albert Camus signature.asc Description: This is a digitally signed message part
