X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=mm%2Fzswap.c;h=025f8dc723dedf60da7d2d9d580ac208e75cd8f6;hb=9c092674beb5cdde6b019f8543cc3f9e2352e035;hp=4043df7c672fb6f5b1be298b8d510fd17a3bbf42;hpb=133d6d1bc2af51adcb8b76551ed0d4480bc78fa5;p=karo-tx-linux.git diff --git a/mm/zswap.c b/mm/zswap.c index 4043df7c672f..025f8dc723de 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -82,33 +82,27 @@ module_param_named(enabled, zswap_enabled, bool, 0644); /* Crypto compressor to use */ #define ZSWAP_COMPRESSOR_DEFAULT "lzo" -static char zswap_compressor[CRYPTO_MAX_ALG_NAME] = ZSWAP_COMPRESSOR_DEFAULT; -static struct kparam_string zswap_compressor_kparam = { - .string = zswap_compressor, - .maxlen = sizeof(zswap_compressor), -}; +static char *zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT; static int zswap_compressor_param_set(const char *, const struct kernel_param *); static struct kernel_param_ops zswap_compressor_param_ops = { .set = zswap_compressor_param_set, - .get = param_get_string, + .get = param_get_charp, + .free = param_free_charp, }; module_param_cb(compressor, &zswap_compressor_param_ops, - &zswap_compressor_kparam, 0644); + &zswap_compressor, 0644); /* Compressed storage zpool to use */ #define ZSWAP_ZPOOL_DEFAULT "zbud" -static char zswap_zpool_type[32 /* arbitrary */] = ZSWAP_ZPOOL_DEFAULT; -static struct kparam_string zswap_zpool_kparam = { - .string = zswap_zpool_type, - .maxlen = sizeof(zswap_zpool_type), -}; +static char *zswap_zpool_type = ZSWAP_ZPOOL_DEFAULT; static int zswap_zpool_param_set(const char *, const struct kernel_param *); static struct kernel_param_ops zswap_zpool_param_ops = { - .set = zswap_zpool_param_set, - .get = param_get_string, + .set = zswap_zpool_param_set, + .get = param_get_charp, + .free = param_free_charp, }; -module_param_cb(zpool, &zswap_zpool_param_ops, &zswap_zpool_kparam, 0644); +module_param_cb(zpool, &zswap_zpool_param_ops, &zswap_zpool_type, 0644); /* The maximum percentage of memory that the compressed pool can occupy */ static unsigned int zswap_max_pool_percent = 20; @@ -342,7 +336,7 @@ static void zswap_entry_put(struct zswap_tree *tree, static struct zswap_entry *zswap_entry_find_get(struct rb_root *root, pgoff_t offset) { - struct zswap_entry *entry = NULL; + struct zswap_entry *entry; entry = zswap_rb_search(root, offset); if (entry) @@ -571,7 +565,7 @@ static struct zswap_pool *zswap_pool_find_get(char *type, char *compressor) static struct zswap_pool *zswap_pool_create(char *type, char *compressor) { struct zswap_pool *pool; - gfp_t gfp = __GFP_NORETRY | __GFP_NOWARN; + gfp_t gfp = __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM; pool = kzalloc(sizeof(*pool), GFP_KERNEL); if (!pool) { @@ -615,19 +609,29 @@ error: return NULL; } -static struct zswap_pool *__zswap_pool_create_fallback(void) +static __init struct zswap_pool *__zswap_pool_create_fallback(void) { if (!crypto_has_comp(zswap_compressor, 0, 0)) { + if (!strcmp(zswap_compressor, ZSWAP_COMPRESSOR_DEFAULT)) { + pr_err("default compressor %s not available\n", + zswap_compressor); + return NULL; + } pr_err("compressor %s not available, using default %s\n", zswap_compressor, ZSWAP_COMPRESSOR_DEFAULT); - strncpy(zswap_compressor, ZSWAP_COMPRESSOR_DEFAULT, - sizeof(zswap_compressor)); + param_free_charp(&zswap_compressor); + zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT; } if (!zpool_has_pool(zswap_zpool_type)) { + if (!strcmp(zswap_zpool_type, ZSWAP_ZPOOL_DEFAULT)) { + pr_err("default zpool %s not available\n", + zswap_zpool_type); + return NULL; + } pr_err("zpool %s not available, using default %s\n", zswap_zpool_type, ZSWAP_ZPOOL_DEFAULT); - strncpy(zswap_zpool_type, ZSWAP_ZPOOL_DEFAULT, - sizeof(zswap_zpool_type)); + param_free_charp(&zswap_zpool_type); + zswap_zpool_type = ZSWAP_ZPOOL_DEFAULT; } return zswap_pool_create(zswap_zpool_type, zswap_compressor); @@ -684,43 +688,39 @@ static void zswap_pool_put(struct zswap_pool *pool) * param callbacks **********************************/ +/* val must be a null-terminated string */ static int __zswap_param_set(const char *val, const struct kernel_param *kp, char *type, char *compressor) { struct zswap_pool *pool, *put_pool = NULL; - char str[kp->str->maxlen], *s; + char *s = strstrip((char *)val); int ret; - /* - * kp is either zswap_zpool_kparam or zswap_compressor_kparam, defined - * at the top of this file, so maxlen is CRYPTO_MAX_ALG_NAME (64) or - * 32 (arbitrary). - */ - strlcpy(str, val, kp->str->maxlen); - s = strim(str); + /* no change required */ + if (!strcmp(s, *(char **)kp->arg)) + return 0; /* if this is load-time (pre-init) param setting, * don't create a pool; that's done during init. */ if (!zswap_init_started) - return param_set_copystring(s, kp); - - /* no change required */ - if (!strncmp(kp->str->string, s, kp->str->maxlen)) - return 0; + return param_set_charp(s, kp); if (!type) { - type = s; - if (!zpool_has_pool(type)) { - pr_err("zpool %s not available\n", type); + if (!zpool_has_pool(s)) { + pr_err("zpool %s not available\n", s); return -ENOENT; } + type = s; } else if (!compressor) { - compressor = s; - if (!crypto_has_comp(compressor, 0, 0)) { - pr_err("compressor %s not available\n", compressor); + if (!crypto_has_comp(s, 0, 0)) { + pr_err("compressor %s not available\n", s); return -ENOENT; } + compressor = s; + } else { + WARN_ON(1); + return -EINVAL; } spin_lock(&zswap_pools_lock); @@ -736,7 +736,7 @@ static int __zswap_param_set(const char *val, const struct kernel_param *kp, } if (pool) - ret = param_set_copystring(s, kp); + ret = param_set_charp(s, kp); else ret = -EINVAL; @@ -1011,7 +1011,8 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset, /* store */ len = dlen + sizeof(struct zswap_header); ret = zpool_malloc(entry->pool->zpool, len, - __GFP_NORETRY | __GFP_NOWARN, &handle); + __GFP_NORETRY | __GFP_NOWARN | __GFP_KSWAPD_RECLAIM, + &handle); if (ret == -ENOSPC) { zswap_reject_compress_poor++; goto put_dstmem;