AcoSail/kernel_optimize_test
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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull irqchip fix from Thomas Gleixner:
 "A single fix to prevent allocating excessive memory in the GIC/ITS
  driver.

  While the subject of the patch might suggest otherwise this is a real
  fix as some SoCs exceed the memory allocation limits and fail to boot"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gic-v3-its: Cap lpi_id_bits to reduce memory footprint
This commit is contained in:
Linus Torvalds 2018-09-09 06:49:29 -07:00
commit 225ad3cfec
1 changed files with 3 additions and 1 deletions
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4
drivers/irqchip/irq-gic-v3-its.c
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@ -1439,6 +1439,7 @@ static struct irq_chip its_irq_chip = {
* The consequence of the above is that allocation is cost is low, but
* freeing is expensive. We assumes that freeing rarely occurs.
*/
#define ITS_MAX_LPI_NRBITS 16 /* 64K LPIs */
static DEFINE_MUTEX(lpi_range_lock);
static LIST_HEAD(lpi_range_list);
@ -1625,7 +1626,8 @@ static int __init its_alloc_lpi_tables(void)
{
phys_addr_t paddr;
lpi_id_bits = GICD_TYPER_ID_BITS(gic_rdists->gicd_typer);
lpi_id_bits = min_t(u32, GICD_TYPER_ID_BITS(gic_rdists->gicd_typer),
ITS_MAX_LPI_NRBITS);
gic_rdists->prop_page = its_allocate_prop_table(GFP_NOWAIT);
if (!gic_rdists->prop_page) {
pr_err("Failed to allocate PROPBASE\n");