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rcu: Make rcu_gp_init() and rcu_gp_fqs_loop noinline to conserve stack
The kbuild test project found an oversized stack frame in rcu_gp_kthread() for some kernel configurations. This oversizing was due to a very large amount of inlining, which is unnecessary due to the fact that this code executes infrequently. This commit therefore marks rcu_gp_init() and rcu_gp_fqs_loop noinline_for_stack to conserve stack space. Reported-by: kernel test robot <lkp@intel.com> Tested-by: Rong Chen <rong.a.chen@intel.com> [ paulmck: noinline_for_stack per Nathan Chancellor. ] Reviewed-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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1 changed files with 2 additions and 2 deletions
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@ -1733,7 +1733,7 @@ static void rcu_strict_gp_boundary(void *unused)
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/*
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* Initialize a new grace period. Return false if no grace period required.
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*/
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static bool rcu_gp_init(void)
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static noinline_for_stack bool rcu_gp_init(void)
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{
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unsigned long firstseq;
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unsigned long flags;
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@ -1927,7 +1927,7 @@ static void rcu_gp_fqs(bool first_time)
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/*
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* Loop doing repeated quiescent-state forcing until the grace period ends.
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*/
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static void rcu_gp_fqs_loop(void)
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static noinline_for_stack void rcu_gp_fqs_loop(void)
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{
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bool first_gp_fqs;
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int gf = 0;
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