linux-kernel - [PATCH v2 0/4] x86/vdso: Remove remnants of the fake section table

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Message-Id: <20181204212600.28090-1-sean.j.christopherson@intel.com>
Date:   Tue,  4 Dec 2018 13:25:56 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v2 0/4] x86/vdso: Remove remnants of the fake section table

Remove pieces of the vDSO's fake section table mechanism that were left
behind when the vDSO build process reverted to using "objdump -S" to
strip the userspace image.

One of the removed pieces is a 0x340 byte reservation (for 64-bit) in
the .rodata section.  Trimming that fat drops the current image's size
to under 4k, i.e. reduces the effective size of the userspace vDSO
mapping by a full page.

v1->v2:
  - Remove the definition of sym_VDSO_FAKE_SECTION_TABLE_*
  - Add patches 3/4 and 4/4 for additional cleanup

Sean Christopherson (4):
  x86/vdso: Remove obsolete "fake section table" reservation
  x86/vdso: Remove a stale/misleading comment from the linker script
  x86/vdso: Remove struct vdso_sym and its associated export option
  x86/vdso: Rename "required_syms" to "requested_syms"

 arch/x86/entry/vdso/vdso-layout.lds.S | 27 -------------------
 arch/x86/entry/vdso/vdso2c.c          | 37 +++++++++------------------
 arch/x86/entry/vdso/vdso2c.h          | 15 +++++------
 3 files changed, 19 insertions(+), 60 deletions(-)

-- 
2.19.2