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bpf: Simplify freeing logic in linfo and jited_linfo

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This patch simplifies the linfo freeing logic by combining
"bpf_prog_free_jited_linfo()" and "bpf_prog_free_unused_jited_linfo()"
into the new "bpf_prog_jit_attempt_done()".
It is a prep work for the kernel function call support.  In a later
patch, freeing the kernel function call descriptors will also
be done in the "bpf_prog_jit_attempt_done()".

"bpf_prog_free_linfo()" is removed since it is only called by
"__bpf_prog_put_noref()".  The kvfree() are directly called
instead.

It also takes this chance to s/kcalloc/kvcalloc/ for the jited_linfo
allocation.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210325015130.1544323-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau 2021-03-24 18:51:30 -07:00 • committed by Alexei Starovoitov
parent 36e7985160
commit e16301fbe1
4 changed files with 17 additions and 28 deletions
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3
include/linux/filter.h
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@ -877,8 +877,7 @@ void bpf_prog_free_linfo(struct bpf_prog *prog);
void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
const u32 *insn_to_jit_off);
int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
void bpf_prog_free_jited_linfo(struct bpf_prog *prog);
void bpf_prog_free_unused_jited_linfo(struct bpf_prog *prog);
void bpf_prog_jit_attempt_done(struct bpf_prog *prog);
struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);