[PATCH 0/4] x86,mm: vdso fixes for an OOPS and /proc/PID/maps
[This applies to tip/x86/vdso. Patch 1/4 is a resend.] This fixes an OOPS on systems without an HPET and incomplete information in /proc/PID/maps. The latter is done by adding a new vm_ops callback to replace arch_vma_name, which is inflexible and awkward to use correctly. With this series applied, calling mremap on the vdso results in sensible output in /proc/PID/maps and the vvar area shows up correctly. I don't want to guarantee that mremap on the vdso will do anything sensible right now, but that's unchanged from before. In fact, I suspect that mremapping the vdso on 32-bit tasks is rather broken right now due to sigreturn. In current kernels, mremapping the vdso blows away the name: badc0de-badc0de2000 r-xp 00:00 0 Now it doesn't: badc0de-badc0de1000 r-xp 00:00 0[vdso] As a followup, it might pay to replace install_special_mapping with a new install_vdso_mapping function that hardcodes the "[vdso]" name, to separately fix all the other arch_vma_name users (maybe just ARM?) and then kill arch_vma_name completely. NB: This touches core mm code. I'd appreciate some review by the mm folks. Andy Lutomirski (4): x86,vdso: Fix an OOPS accessing the hpet mapping w/o an hpet mm,fs: Add vm_ops->name as an alternative to arch_vma_name x86,mm: Improve _install_special_mapping and fix x86 vdso naming x86,mm: Replace arch_vma_name with vm_ops->name for vsyscalls arch/x86/include/asm/vdso.h | 6 ++- arch/x86/mm/init_64.c| 20 +- arch/x86/vdso/vdso2c.h | 5 ++- arch/x86/vdso/vdso32-setup.c | 7 arch/x86/vdso/vma.c | 26 - fs/binfmt_elf.c | 8 fs/proc/task_mmu.c | 6 +++ include/linux/mm.h | 10 - include/linux/mm_types.h | 6 +++ mm/mmap.c| 89 +--- 10 files changed, 124 insertions(+), 59 deletions(-) -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH 0/4] x86,mm: vdso fixes for an OOPS and /proc/PID/maps
[This applies to tip/x86/vdso. Patch 1/4 is a resend.] This fixes an OOPS on systems without an HPET and incomplete information in /proc/PID/maps. The latter is done by adding a new vm_ops callback to replace arch_vma_name, which is inflexible and awkward to use correctly. With this series applied, calling mremap on the vdso results in sensible output in /proc/PID/maps and the vvar area shows up correctly. I don't want to guarantee that mremap on the vdso will do anything sensible right now, but that's unchanged from before. In fact, I suspect that mremapping the vdso on 32-bit tasks is rather broken right now due to sigreturn. In current kernels, mremapping the vdso blows away the name: badc0de-badc0de2000 r-xp 00:00 0 Now it doesn't: badc0de-badc0de1000 r-xp 00:00 0[vdso] As a followup, it might pay to replace install_special_mapping with a new install_vdso_mapping function that hardcodes the [vdso] name, to separately fix all the other arch_vma_name users (maybe just ARM?) and then kill arch_vma_name completely. NB: This touches core mm code. I'd appreciate some review by the mm folks. Andy Lutomirski (4): x86,vdso: Fix an OOPS accessing the hpet mapping w/o an hpet mm,fs: Add vm_ops-name as an alternative to arch_vma_name x86,mm: Improve _install_special_mapping and fix x86 vdso naming x86,mm: Replace arch_vma_name with vm_ops-name for vsyscalls arch/x86/include/asm/vdso.h | 6 ++- arch/x86/mm/init_64.c| 20 +- arch/x86/vdso/vdso2c.h | 5 ++- arch/x86/vdso/vdso32-setup.c | 7 arch/x86/vdso/vma.c | 26 - fs/binfmt_elf.c | 8 fs/proc/task_mmu.c | 6 +++ include/linux/mm.h | 10 - include/linux/mm_types.h | 6 +++ mm/mmap.c| 89 +--- 10 files changed, 124 insertions(+), 59 deletions(-) -- 1.9.0 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
