On Tue, Jun 24, 2014 at 01:41:34PM +0200, Tomasz Nowicki wrote:
Currently APEI depends on x86 architecture. It is because of NMI hardware error notification of GHES which is currently supported by x86 only. However, many other APEI features can be still used perfectly by other architectures.
This commit adds two symbols:
- HAVE_ACPI_APEI for those archs which support APEI.
- HAVE_ACPI_APEI_NMI which is used for NMI code isolation in ghes.c file. NMI related data and functions are grouped so they can be wrapped inside one #ifdef section. Appropriate function stubs are provided for !NMI case.
Note there is no functional changes for x86 due to hard selected HAVE_ACPI_APEI and HAVE_ACPI_APEI_NMI symbols.
Signed-off-by: Tomasz Nowicki tomasz.nowicki@linaro.org
arch/x86/Kconfig | 2 + drivers/acpi/apei/Kconfig | 8 ++- drivers/acpi/apei/ghes.c | 149 +++++++++++++++++++++++++++++---------------- include/linux/nmi.h | 4 ++ 4 files changed, 110 insertions(+), 53 deletions(-)
...
@@ -894,11 +892,71 @@ static unsigned long ghes_esource_prealloc_size( return prealloc_size; } +static void ghes_estatus_pool_shrink(unsigned long len) +{
- ghes_estatus_pool_size_request -= PAGE_ALIGN(len);
+}
+static void ghes_nmi_add(struct ghes *ghes) +{
- unsigned long len;
- len = ghes_esource_prealloc_size(ghes->generic);
- ghes_estatus_pool_expand(len);
- mutex_lock(&ghes_list_mutex);
- if (list_empty(&ghes_nmi))
register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");- list_add_rcu(&ghes->list, &ghes_nmi);
- mutex_unlock(&ghes_list_mutex);
+}
+static void ghes_nmi_remove(struct ghes *ghes) +{
- unsigned long len;
- mutex_lock(&ghes_list_mutex);
- list_del_rcu(&ghes->list);
- if (list_empty(&ghes_nmi))
unregister_nmi_handler(NMI_LOCAL, "ghes");- mutex_unlock(&ghes_list_mutex);
- /*
* To synchronize with NMI handler, ghes can only be* freed after NMI handler finishes.*/- synchronize_rcu();
- len = ghes_esource_prealloc_size(ghes->generic);
- ghes_estatus_pool_shrink(len);
+}
+static void ghes_nmi_init_cxt(void) +{
- init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
+} +#else
Markers please to know to which CONFIG_ symbol this #else refers to:
#else /* CONFIG_HAVE_ACPI_APEI_NMI */
+static inline void ghes_nmi_add(struct ghes *ghes) +{
- pr_err(GHES_PFX "ID: %d, trying to add NMI notification which is not supported!\n",
ghes->generic->header.source_id);- BUG();
+}
+static inline void ghes_nmi_remove(struct ghes *ghes) +{
- pr_err(GHES_PFX "ID: %d, trying to remove NMI notification which is not supported!\n",
ghes->generic->header.source_id);- BUG();
+}
+static inline void ghes_nmi_init_cxt(void) +{ +} +#endif
Ditto.