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powerpc/64: Add CONFIG_PPC_BARRIER_NOSPEC

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Add a config symbol to encode which platforms support the
barrier_nospec speculation barrier. Currently this is just Book3S 64
but we will add Book3E in a future patch.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman
2018-07-28 09:06:34 +10:00
parent 6453b532f2
commit 179ab1cbf8
7 changed files with 22 additions and 10 deletions
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4
arch/powerpc/kernel/module.c
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@@ -72,13 +72,15 @@ int module_finalize(const Elf_Ehdr *hdr,
do_feature_fixups(powerpc_firmware_features,
(void *)sect->sh_addr,
(void *)sect->sh_addr + sect->sh_size);
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC_BARRIER_NOSPEC
sect = find_section(hdr, sechdrs, "__spec_barrier_fixup");
if (sect != NULL)
do_barrier_nospec_fixups_range(barrier_nospec_enabled,
(void *)sect->sh_addr,
(void *)sect->sh_addr + sect->sh_size);
#endif
#endif /* CONFIG_PPC_BARRIER_NOSPEC */
sect = find_section(hdr, sechdrs, "__lwsync_fixup");
if (sect != NULL)