linux-dev/arch/powerpc/kernel/vdso.c, branch linus/master

powerpc: Remove asm/prom.h from all files that don't need it

2022-05-08T12:15:04Z

Several files include asm/prom.h for no reason. Clean it up. Signed-off-by: Christophe Leroy [mpe: Drop change to prom_parse.c as reported by lkp@intel.com] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/7c9b8fda63dcf63e1b28f43e7ebdb95182cbc286.1646767214.git.christophe.leroy@csgroup.eu

powerpc/vdso: Add support for time namespaces

2021-04-14T13:04:44Z

This patch adds the necessary glue to provide time namespaces. Things are mainly copied from ARM64. __arch_get_timens_vdso_data() calculates timens vdso data position based on the vdso data position, knowing it is the next page in vvar. This avoids having to redo the mflr/bcl/mflr/mtlr dance to locate the page relative to running code position. Signed-off-by: Christophe Leroy Reviewed-by: Vincenzo Frascino # vDSO parts Acked-by: Andrei Vagin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1a15495f80ec19a87b16cf874dbf7c3fa5ec40fe.1617209142.git.christophe.leroy@csgroup.eu

powerpc/vdso: Separate vvar vma from vdso

2021-04-14T13:04:44Z

Since commit 511157ab641e ("powerpc/vdso: Move vdso datapage up front") VVAR page is in front of the VDSO area. In result it breaks CRIU (Checkpoint Restore In Userspace) [1], where CRIU expects that "[vdso]" from /proc/../maps points at ELF/vdso image, rather than at VVAR data page. Laurent made a patch to keep CRIU working (by reading aux vector). But I think it still makes sence to separate two mappings into different VMAs. It will also make ppc64 less "special" for userspace and as a side-bonus will make VVAR page un-writable by debugger (which previously would COW page and can be unexpected). I opportunistically Cc stable on it: I understand that usually such stuff isn't a stable material, but that will allow us in CRIU have one workaround less that is needed just for one release (v5.11) on one platform (ppc64), which we otherwise have to maintain. I wouldn't go as far as to say that the commit 511157ab641e is ABI regression as no other userspace got broken, but I'd really appreciate if it gets backported to v5.11 after v5.12 is released, so as not to complicate already non-simple CRIU-vdso code. Thanks! [1]: https://github.com/checkpoint-restore/criu/issues/1417 Cc: stable@vger.kernel.org # v5.11 Signed-off-by: Dmitry Safonov Signed-off-by: Christophe Leroy Tested-by: Christophe Leroy Reviewed-by: Vincenzo Frascino # vDSO parts. Acked-by: Andrei Vagin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/f401eb1ebc0bfc4d8f0e10dc8e525fd409eb68e2.1617209142.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove DBG()

2020-12-03T14:01:19Z

DBG() is not used anymore. Remove it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/e11a9b50e709f197bb3aa2ed1d80d2dee8714afc.1601197618.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove vdso_ready

2020-12-03T14:01:19Z

There is no way to get out of vdso_init() prematuraly anymore. Remove vdso_ready as it will always be 1. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/0e1e18c6329b848aa3edeeba76509b4d76182e7d.1601197618.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove vdso_setup()

2020-12-03T14:01:19Z

vdso_fixup_features() cannot fail anymore and that's the only function called by vdso_setup(). vdso_setup() has become trivial and can be removed. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/11522eec6140f510a8c89c63cbb739277d097fdc.1601197618.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove lib32_elfinfo and lib64_elfinfo

2020-12-03T14:01:19Z

lib32_elfinfo and lib64_elfinfo are not used anymore, remove them. Also remove vdso32_kbase and vdso64_kbase while removing the last use. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/01ac65abf22f0428f8f764525a7d84459c54d806.1601197618.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove symbol section information in struct lib32/64_elfinfo

2020-12-03T14:01:18Z

The members related to the symbol section in struct lib32_elfinfo and struct lib64_elfinfo are not used anymore, removed them. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b779e5b7cc0354e2f87fd407fe5b02f4a8a73825.1601197618.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove unused text member in struct lib32/64_elfinfo

2020-12-03T14:01:18Z

The text member in struct lib32_elfinfo and struct lib64_elfinfo is not used, remove it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/f53dcc9bb1946a7854d15b34d03d3d2e2003848c.1601197618.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove vdso_patches[] and associated functions

2020-12-03T14:01:18Z

vdso_patches[] is now empty, remove it and remove all functions that depends on it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/27d75debd6e4ddeaffe1d66ffed1e7526684a004.1601197618.git.christophe.leroy@csgroup.eu