diff options
| -rw-r--r-- | linux-core/drm_compat.c | 47 | ||||
| -rw-r--r-- | linux-core/drm_compat.h | 5 |
2 files changed, 52 insertions, 0 deletions
diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c index 9a6da7e9..e51aedb7 100644 --- a/linux-core/drm_compat.c +++ b/linux-core/drm_compat.c @@ -678,4 +678,51 @@ void idr_remove_all(struct idr *idp) idp->layers = 0; } EXPORT_SYMBOL(idr_remove_all); + +#endif /* DRM_IDR_COMPAT_FN */ + + + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)) +/** + * idr_replace - replace pointer for given id + * @idp: idr handle + * @ptr: pointer you want associated with the id + * @id: lookup key + * + * Replace the pointer registered with an id and return the old value. + * A -ENOENT return indicates that @id was not found. + * A -EINVAL return indicates that @id was not within valid constraints. + * + * The caller must serialize vs idr_find(), idr_get_new(), and idr_remove(). + */ +void *idr_replace(struct idr *idp, void *ptr, int id) +{ + int n; + struct idr_layer *p, *old_p; + + n = idp->layers * IDR_BITS; + p = idp->top; + + id &= MAX_ID_MASK; + + if (id >= (1 << n)) + return ERR_PTR(-EINVAL); + + n -= IDR_BITS; + while ((n > 0) && p) { + p = p->ary[(id >> n) & IDR_MASK]; + n -= IDR_BITS; + } + + n = id & IDR_MASK; + if (unlikely(p == NULL || !test_bit(n, &p->bitmap))) + return ERR_PTR(-ENOENT); + + old_p = p->ary[n]; + p->ary[n] = ptr; + + return (void *)old_p; +} +EXPORT_SYMBOL(idr_replace); #endif diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h index 0b00ba47..94db8533 100644 --- a/linux-core/drm_compat.h +++ b/linux-core/drm_compat.h @@ -316,4 +316,9 @@ int idr_for_each(struct idr *idp, void idr_remove_all(struct idr *idp); #endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)) +void *idr_replace(struct idr *idp, void *ptr, int id); +#endif + #endif |