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Date: Fri, 2 May 2014 13:15:42 -0700 From: Andy Lutomirski <luto@...capital.net> To: "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org Cc: Stefani Seibold <stefani@...bold.net>, linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...capital.net> Subject: [PATCH v3 0/6] Clean up and unify the vDSO This rewrites a bunch of the vdso code. After these patches, the vvar and hpet pages are mapped directly after the vdso text on all five vdso variants. The fixmaps are gone on 64-bit systems. It would be possible to build the x32 vdso the normal way on top of these patches. I haven't touched the pvclock code. I'd want to understand why it exists, why it isn't using rdtsc, and why it has two rdtsc_barrier calls before rearranging it. In a discussion with Marcello Tosatti, I think we concluded that the kvmclock code could be significantly simplified and sped up without breaking anything, but I want to save that for later. This should apply to -linus or to tip/x86/vdso. It's also here: https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/log/?h=vdso/cleanups Changes from v2: - Fixed the 32-bit build. Hopefully I didn't screw up bisection. Changes from v1: - Rebased - I think Gold is working (this is a side effect of the rebase) Andy Lutomirski (6): x86: Clean up 32-bit vs 64-bit vdso params x86: Move syscall and sysenter setup into kernel/cpu/common.c x86: Reimplement vdso.so preparation in build-time C x86: Move the 32-bit vdso special pages after the text x86: Move the vvar and hpet mappings next to the 64-bit vDSO x86: Remove vestiges of VDSO_PRELINK and some outdated comments arch/x86/ia32/ia32_signal.c | 8 +- arch/x86/include/asm/elf.h | 35 +++--- arch/x86/include/asm/fixmap.h | 10 +- arch/x86/include/asm/mmu.h | 2 +- arch/x86/include/asm/proto.h | 2 - arch/x86/include/asm/vdso.h | 74 +++++------- arch/x86/include/asm/vdso32.h | 11 -- arch/x86/include/asm/vvar.h | 20 +--- arch/x86/include/uapi/asm/vsyscall.h | 7 +- arch/x86/kernel/cpu/common.c | 33 ++++++ arch/x86/kernel/hpet.c | 3 - arch/x86/kernel/signal.c | 6 +- arch/x86/kernel/vsyscall_64.c | 15 +-- arch/x86/mm/fault.c | 5 +- arch/x86/mm/init_64.c | 13 +- arch/x86/um/vdso/vma.c | 2 +- arch/x86/vdso/.gitignore | 5 +- arch/x86/vdso/Makefile | 90 +++++--------- arch/x86/vdso/vclock_gettime.c | 26 ++-- arch/x86/vdso/vdso-layout.lds.S | 40 ++++--- arch/x86/vdso/vdso.S | 3 - arch/x86/vdso/vdso.lds.S | 7 +- arch/x86/vdso/vdso2c.c | 156 ++++++++++++++++++++++++ arch/x86/vdso/vdso2c.h | 154 ++++++++++++++++++++++++ arch/x86/vdso/vdso32-setup.c | 196 ++++--------------------------- arch/x86/vdso/vdso32.S | 9 -- arch/x86/vdso/vdso32/vdso32.lds.S | 15 +-- arch/x86/vdso/vdsox32.S | 3 - arch/x86/vdso/vdsox32.lds.S | 7 +- arch/x86/vdso/vma.c | 222 +++++++++++++++++++---------------- arch/x86/xen/mmu.c | 8 +- arch/x86/xen/setup.c | 11 +- kernel/sysctl.c | 5 + 33 files changed, 647 insertions(+), 556 deletions(-) delete mode 100644 arch/x86/include/asm/vdso32.h delete mode 100644 arch/x86/vdso/vdso.S create mode 100644 arch/x86/vdso/vdso2c.c create mode 100644 arch/x86/vdso/vdso2c.h delete mode 100644 arch/x86/vdso/vdso32.S delete mode 100644 arch/x86/vdso/vdsox32.S -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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