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| author | Shay Drory <shayd@nvidia.com> | 2024-08-06 10:20:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-14 13:58:58 +0200 |
| commit | 0688cacd0e93a682c5e4b84aa34e42b3cea03924 (patch) | |
| tree | 0bf2167e9f00a6bb4b26f7a06b27b236fc67d770 | |
| parent | 2ce998fabc630a875ff3e0ddeb19106da7036fd3 (diff) | |
| download | linux-0688cacd0e93a682c5e4b84aa34e42b3cea03924.tar.gz linux-0688cacd0e93a682c5e4b84aa34e42b3cea03924.tar.bz2 linux-0688cacd0e93a682c5e4b84aa34e42b3cea03924.zip | |
genirq/irqdesc: Honor caller provided affinity in alloc_desc()
commit edbbaae42a56f9a2b39c52ef2504dfb3fb0a7858 upstream.
Currently, whenever a caller is providing an affinity hint for an
interrupt, the allocation code uses it to calculate the node and copies the
cpumask into irq_desc::affinity.
If the affinity for the interrupt is not marked 'managed' then the startup
of the interrupt ignores irq_desc::affinity and uses the system default
affinity mask.
Prevent this by setting the IRQD_AFFINITY_SET flag for the interrupt in the
allocator, which causes irq_setup_affinity() to use irq_desc::affinity on
interrupt startup if the mask contains an online CPU.
[ tglx: Massaged changelog ]
Fixes: 45ddcecbfa94 ("genirq: Use affinity hint in irqdesc allocation")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/all/20240806072044.837827-1-shayd@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/irq/irqdesc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 5c9888901ef4..46094f0c9fcd 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -517,6 +517,7 @@ static int alloc_descs(unsigned int start, unsigned int cnt, int node, flags = IRQD_AFFINITY_MANAGED | IRQD_MANAGED_SHUTDOWN; } + flags |= IRQD_AFFINITY_SET; mask = &affinity->mask; node = cpu_to_node(cpumask_first(mask)); affinity++; |