标签：return ons nbsp val ptr csharp buffer scripts branch
#if 1 //zjr
#define __compiletime_assert(condition, msg, prefix, suffix) BUG_ON(!condition)
#else
#define __compiletime_assert(condition, msg, prefix, suffix) do { bool __cond = !(condition); extern void prefix ## suffix(void) __compiletime_error(msg); if (__cond) prefix ## suffix(); __compiletime_error_fallback(__cond); } while (0)
#endif
避免缺乏了编译预判后，编译时的报错被触发。
static __always_inline bool arch_static_branch(struct static_key *key)
{
#if 0 //zjr
asm goto("1: nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".align 3\n\t"
".quad 1b, %l[l_yes], %c0\n\t"
".popsection\n\t"
: : "i"(key) : : l_yes);
return false;
l_yes:
#endif
return true;
}
PS： JUMP TABLE是对unlikely/likely的优化，彻底去掉了if语句，用jmp指令代替，详见：https://blog.csdn.net/dog250/article/details/6123517
if (dump_write)
write_dump(dump_write);
#if 0 //zjr
if (sec_mismatch_count && !sec_mismatch_verbose)
warn("modpost: Found %d section mismatch(es).\n"
"To see full details build your kernel with:\n"
"‘make CONFIG_DEBUG_SECTION_MISMATCH=y‘\n",
sec_mismatch_count);
#else
err = 0;
#endif
return err;
jianrongzeng@zjr:linux$ grep -rnwI zjr ./fs/* -A 20 ./fs/ext4/namei.c:3190:// zjr ./fs/ext4/namei.c-3191-#ifdef CONFIG_EXT4_FS_ENCRYPTION ./fs/ext4/namei.c-3192- err = ext4_inherit_context(dir, inode); ./fs/ext4/namei.c-3193- if (err) ./fs/ext4/namei.c-3194- goto err_drop_inode; ./fs/ext4/namei.c-3195-#endif ./fs/ext4/namei.c-3196- ctx = ext4_get_fname_crypto_ctx(inode, ./fs/ext4/namei.c-3197- inode->i_sb->s_blocksize); ./fs/ext4/namei.c-3198- if (IS_ERR_OR_NULL(ctx)) { ./fs/ext4/namei.c-3199- /* We just set the policy, so ctx should not be NULL */ ./fs/ext4/namei.c-3200- err = (ctx == NULL) ? -EIO : PTR_ERR(ctx); ./fs/ext4/namei.c-3201- goto err_drop_inode; ./fs/ext4/namei.c-3202- } ./fs/ext4/namei.c-3203- istr.name = (const unsigned char *) symname; ./fs/ext4/namei.c-3204- istr.len = len; ./fs/ext4/namei.c-3205- ostr.name = sd->encrypted_path; ./fs/ext4/namei.c-3206- err = ext4_fname_usr_to_disk(ctx, &istr, &ostr); ./fs/ext4/namei.c-3207- ext4_put_fname_crypto_ctx(&ctx); ./fs/ext4/namei.c-3208- if (err < 0) ./fs/ext4/namei.c-3209- goto err_drop_inode; ./fs/ext4/namei.c-3210- sd->len = cpu_to_le16(ostr.len); -- ./fs/ext4/ext4.h:2047:// zjr ./fs/ext4/ext4.h-2048-#ifdef CONFIG_EXT4_FS_ENCRYPTION ./fs/ext4/ext4.h-2049-int ext4_is_child_context_consistent_with_parent(struct inode *parent, ./fs/ext4/ext4.h-2050- struct inode *child); ./fs/ext4/ext4.h-2051-int ext4_inherit_context(struct inode *parent, struct inode *child); ./fs/ext4/ext4.h-2052-void ext4_to_hex(char *dst, char *src, size_t src_size); ./fs/ext4/ext4.h-2053-int ext4_process_policy(const struct ext4_encryption_policy *policy, ./fs/ext4/ext4.h-2054- struct inode *inode); ./fs/ext4/ext4.h-2055-int ext4_get_policy(struct inode *inode, ./fs/ext4/ext4.h-2056- struct ext4_encryption_policy *policy); ./fs/ext4/ext4.h-2057-#else ./fs/ext4/ext4.h-2058-static inline int ext4_is_child_context_consistent_with_parent(struct inode *parent, ./fs/ext4/ext4.h-2059- struct inode *child) { return 0; } ./fs/ext4/ext4.h-2060-//static inline int ext4_inherit_context(struct inode *parent, struct inode *child); ./fs/ext4/ext4.h-2061-static inline void ext4_to_hex(char *dst, char *src, size_t src_size) {} ./fs/ext4/ext4.h-2062-static inline int ext4_process_policy(const struct ext4_encryption_policy *policy, ./fs/ext4/ext4.h-2063- struct inode *inode) { return 0; } ./fs/ext4/ext4.h-2064-static inline int ext4_get_policy(struct inode *inode, ./fs/ext4/ext4.h-2065- struct ext4_encryption_policy *policy) { return 0; } ./fs/ext4/ext4.h-2066-#endif ./fs/ext4/ext4.h-2067- -- ./fs/ext4/ext4.h:2069:// zjr ./fs/ext4/ext4.h-2070-#ifdef CONFIG_EXT4_FS_ENCRYPTION ./fs/ext4/ext4.h-2071-bool ext4_valid_contents_enc_mode(uint32_t mode); ./fs/ext4/ext4.h-2072-uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); ./fs/ext4/ext4.h-2073-extern struct workqueue_struct *ext4_read_workqueue; ./fs/ext4/ext4.h-2074-struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); ./fs/ext4/ext4.h-2075-void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); ./fs/ext4/ext4.h-2076-void ext4_restore_control_page(struct page *data_page); ./fs/ext4/ext4.h-2077-struct page *ext4_encrypt(struct inode *inode, ./fs/ext4/ext4.h-2078- struct page *plaintext_page); ./fs/ext4/ext4.h-2079-int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page); ./fs/ext4/ext4.h-2080-int ext4_decrypt_one(struct inode *inode, struct page *page); ./fs/ext4/ext4.h-2081-int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex); ./fs/ext4/ext4.h-2082-#else ./fs/ext4/ext4.h-2083-static inline bool ext4_valid_contents_enc_mode(uint32_t mode) { return true; } ./fs/ext4/ext4.h-2084-static inline uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size) { return 0; } ./fs/ext4/ext4.h-2085-static struct workqueue_struct *ext4_read_workqueue; ./fs/ext4/ext4.h-2086-static inline struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode) { return NULL; } ./fs/ext4/ext4.h-2087-static inline void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx) {} ./fs/ext4/ext4.h-2088-static inline void ext4_restore_control_page(struct page *data_page) {} ./fs/ext4/ext4.h-2089-static inline struct page *ext4_encrypt(struct inode *inode, -- ./fs/ext4/ext4.h:2113:// zjr ./fs/ext4/ext4.h-2114-#ifdef CONFIG_EXT4_FS_ENCRYPTION ./fs/ext4/ext4.h-2115-bool ext4_valid_filenames_enc_mode(uint32_t mode); ./fs/ext4/ext4.h-2116-u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); ./fs/ext4/ext4.h-2117-int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx, ./fs/ext4/ext4.h-2118- u32 ilen, struct ext4_str *crypto_str); ./fs/ext4/ext4.h-2119-int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx, ./fs/ext4/ext4.h-2120- struct dx_hash_info *hinfo, ./fs/ext4/ext4.h-2121- const struct ext4_str *iname, ./fs/ext4/ext4.h-2122- struct ext4_str *oname); ./fs/ext4/ext4.h-2123-int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx, ./fs/ext4/ext4.h-2124- struct dx_hash_info *hinfo, ./fs/ext4/ext4.h-2125- const struct ext4_dir_entry_2 *de, ./fs/ext4/ext4.h-2126- struct ext4_str *oname); ./fs/ext4/ext4.h-2127-int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx, ./fs/ext4/ext4.h-2128- const struct qstr *iname, ./fs/ext4/ext4.h-2129- struct ext4_str *oname); ./fs/ext4/ext4.h-2130-int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx, ./fs/ext4/ext4.h-2131- const struct qstr *iname, ./fs/ext4/ext4.h-2132- struct dx_hash_info *hinfo); ./fs/ext4/ext4.h-2133-int ext4_fname_crypto_namelen_on_disk(struct ext4_fname_crypto_ctx *ctx, -- ./fs/ext4/ext4.h:2184:// zjr ./fs/ext4/ext4.h-2185-#ifdef CONFIG_EXT4_FS_ENCRYPTION ./fs/ext4/ext4.h-2186-int ext4_generate_encryption_key(struct inode *inode); ./fs/ext4/ext4.h-2187-#else ./fs/ext4/ext4.h-2188-static inline ./fs/ext4/ext4.h-2189-int ext4_generate_encryption_key(struct inode *inode) { return 0; } ./fs/ext4/ext4.h-2190-#endif
标签：return ons nbsp val ptr csharp buffer scripts branch
原文地址：https://www.cnblogs.com/zengjianrong/p/13063363.html
