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powerpc/lib: Add helper to check if offset is within conditional branch range

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upstream commit 4549c3ea3160fa8b3f37dfe2f957657bb265eda9

Add a helper to check if a given offset is within the branch range for a
powerpc conditional branch instruction, and update some sites to use the
new helper.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/442b69a34ced32ca346a0d9a855f3f6cfdbbbd41.1633464148.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen N. Rao
2021-11-15 16:36:27 +05:30
committed by Greg Kroah-Hartman
parent 74293225f5
commit 51cf71d5cb
3 changed files with 8 additions and 7 deletions
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1
arch/powerpc/include/asm/code-patching.h
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@@ -23,6 +23,7 @@
#define BRANCH_ABSOLUTE 0x2
bool is_offset_in_branch_range(long offset);
bool is_offset_in_cond_branch_range(long offset);
int create_branch(struct ppc_inst *instr, const struct ppc_inst *addr,
unsigned long target, int flags);
int create_cond_branch(struct ppc_inst *instr, const struct ppc_inst *addr,