Andy Lutomirski
a6c19dfe39
arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area
...
The core mm code will provide a default gate area based on
FIXADDR_USER_START and FIXADDR_USER_END if
!defined(__HAVE_ARCH_GATE_AREA) && defined(AT_SYSINFO_EHDR).
This default is only useful for ia64. arm64, ppc, s390, sh, tile, 64-bit
UML, and x86_32 have their own code just to disable it. arm, 32-bit UML,
and x86_64 have gate areas, but they have their own implementations.
This gets rid of the default and moves the code into ia64.
This should save some code on architectures without a gate area: it's now
possible to inline the gate_area functions in the default case.
Signed-off-by: Andy Lutomirski <luto@amacapital.net >
Acked-by: Nathan Lynch <nathan_lynch@mentor.com >
Acked-by: H. Peter Anvin <hpa@linux.intel.com >
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org > [in principle]
Acked-by: Richard Weinberger <richard@nod.at > [for um]
Acked-by: Will Deacon <will.deacon@arm.com > [for arm64]
Cc: Catalin Marinas <catalin.marinas@arm.com >
Cc: Will Deacon <will.deacon@arm.com >
Cc: Tony Luck <tony.luck@intel.com >
Cc: Fenghua Yu <fenghua.yu@intel.com >
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org >
Cc: Paul Mackerras <paulus@samba.org >
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com >
Cc: Heiko Carstens <heiko.carstens@de.ibm.com >
Cc: Chris Metcalf <cmetcalf@tilera.com >
Cc: Jeff Dike <jdike@addtoit.com >
Cc: Richard Weinberger <richard@nod.at >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: Ingo Molnar <mingo@redhat.com >
Cc: "H. Peter Anvin" <hpa@zytor.com >
Cc: Nathan Lynch <Nathan_Lynch@mentor.com >
Signed-off-by: Andrew Morton <akpm@linux-foundation.org >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
2014-08-08 15:57:27 -07:00
Chris Metcalf
4a556f4f56
tile: implement gettimeofday() via vDSO
...
This change creates the framework for vDSO calls, makes the existing
rt_sigreturn() mechanism use it, and adds a fast gettimeofday().
Now that we need to expose the vDSO address to userspace, we add
AT_SYSINFO_EHDR to the set of aux entries provided to userspace.
(You can disable any extra vDSO support by booting with vdso=0,
but the rt_sigreturn vDSO page will still be provided.)
Note that glibc has supported the tile vDSO since release 2.17.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com >
2013-08-13 16:26:21 -04:00
